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. 2023 Aug 25;23(17):7414. doi: 10.3390/s23177414

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© 2023 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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(a) Mixer tuning and receiver calibration block, composed of the SIS mixer backshort motor control board and the receiver calibration motor control board. (b) Inner waveguide structure of the SIS mixer showing the movable backshort and the mixer chip [32,33].